2012/01/13 by Durmuş Karabacak, Durmus Karabacak, S. Nandi +2 · 9 citations
Physics and Astronomy · #Collider #Diquark #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #hep-ph
paper · pdf · doi:10.1103/physrevd.85.075011
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 85(7) (American Physical Society) · 19 pages, 16 eps figures
arxiv created 2012/01/13 · openalex publication_date 2012/04/12 · arxiv updated 2013/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
New physics at the TeV scale is highly anticipated at the LHC. New particles with color, if within the LHC energy reach, will be copiously produced. One such particle is a diquark, having the quantum numbers of two quarks, and can be either a scalar or a vector. It will decay to two light quarks, or two top quarks, or a top and a light quark, (up-type or down-type depending on the quantum number of the produced diquark). If singly produced, it can be looked for as a dijet resonance, or as giving extra contribution to the single top production or tt production. In this work, we consider a color-sextet vector diquark having the quantum number of (ud)-type, its resonance production, and the subsequent decay to tb, giving rise to excess contribution to the single top production. Even though the diquark mass is large, its strong resonance production dominates the weak production of tb for a wide range of the diquark mass. Also, its subsequent decay to tb produces a very hard b jet compared to the usual electroweak production. In addition, the missing energy in the final state event is much larger from the massive diquark decays. Thus, with suitable cuts, the final state with b, b and a charged lepton together with large missing energy stands out compared to the standard model background. We perform a detailed study of both the signal and the background. We find that such a diquark is accessible at the 7 TeV LHC up to a mass of about 3.3 TeV with the luminosity 1 fb^\ensuremath-1, while the reach goes up to about 4.3 TeV with a luminosity of 10 fb^\ensuremath-1.